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      |  | Madsen & T. Baagoes Electroplet og Nysølvvarefabrik
 founded 1874
 Copenhagen
 Denmark
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  | Maltby, Stevens & Curtiss Co. founded c1890, successors to Maltby, Henley & Co.
 a subsidiary of International Silver from 1898
 Wallingford, CT
 USA
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      |  | William Mammatt 1867-1906, "& Sons" from 1886, successors to Mammatt, Buxton & Co.
 Sheffield
 England, UK
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      |  | Manhattan Plate Co. 1856-1871
 New York, NY
 USA
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      |  | Manhattan Plating Co. 1872-1877, successor to Manhattan Plate Co.
 New York, NY
 USA
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      |  | Manhattan Silver Plate Co. 1877-1898, successor to Manhattan Plating Co., became a subsidiary of International Silver Co., in 1898
 New York, NY
 USA
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  | Manning, Bowman & Co. Founded 1857, electroplating from 1866
 Meriden, CT
 USA
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    | Mappin Brothers founded 1850, electroplate from c.1865-c.1903
 Sheffield
 England, UK
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  | Mappin & Webb from 1873, successors to Mappin, Webb & Co. (1864-1872), founded 1859 as Mappin & Co.
 Sheffield & London
 England, UK
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  | Marlboro Plate from 1945, trademark of Morton-Parker Ltd.
 Trenton, Ontario
 Canada
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  | Thorvald Marthinsen founded 1883
 Tonsberg
 Norway
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  | Martian from c.1949, trademark of Sato Shoji Corp., stainless & nickel silver flatware & holloware
 Tokyo
 Japan
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  | Martin, Hall & Co. 1854-1934
 Sheffield
 England, UK
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      |  | Joshua Maxfield & Sons founded c.1894
 Sheffield
 England, UK
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      |  | Benjamin James Mayo 1862-c.1910
 Newark, NJ
 USA
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